CN104100909B - A kind of adaptive front lamp method for designing based on fly's-eye lens - Google Patents

Abstract

The present invention discloses a kind of adaptive front lamp method for designing based on fly's-eye lens.In car headlamp field, there is the shortcomings such as control not precisely light and the efficiency of light energy utilization is low in existing technology.The present invention includes projection part and reflecting part, in projection part, adopt the collimate light that LED sends by paraboloid and collimation lens, with double fly's-eye lens and convergent lens homogenizer is imaged on digital micro-mirror again, often arranges fly's-eye lens and be made up of three kinds of difform lenslets.The beneficial effect of present design is: the light illumination mode control precisely, realized is many and the effect of various light illumination mode is all good; Distance light and dipped beam are separately realized, reduces heat radiation difficulty; Utilize fly's-eye lens to be formed on digital micro-mirror evenly and there is the hot spot of "cut-off"line, saving luminous energy, improve the efficiency of light energy utilization; With double fly's-eye lens as equal photosystem, light path is short and all light effect is good.

Description

A kind of adaptive front lamp method for designing based on fly's-eye lens

Technical field

The present invention relates to a kind of technical field of car headlamp, especially a kind of adaptive front lamp method for designing based on fly's-eye lens.

Background technology

Self-adaptive headlamp system (AFS, AdaptiveFrontLightingSystem) automatically can regulate the power of the light type of headlamp, the distance of light beam irradiation and brightness according to the change of surrounding enviroment in good time, the illumination zone, illumination distances and the light angle that are more suitable for are provided.Adaptive front lamp be equipped with distance light, dipped beam, bend, climb and fall, town road, at a high speed, the light illumination mode such as sleety weather.Also bending light pattern, by controlling headlamp horizontal rotation angle, provides enough illuminations to bend, eliminates bend dark space; Climb and fall light illumination mode passes through to control headlamp vertical deflection angle, dazzle when increasing visual field when going up a slope or reduce descending; Town road pattern exports broader light type, improves illumination width, increases driver's seat; Fast mode exports narrower and longer light type, improves illumination depth, meets the needs of high vehicle speeds; Sleety weather light illumination mode reduces the illumination of subregion, weakens the dazzle that the reflection because of excess surface water produces human eye.

Existing adaptive front lamp has three kinds of implementations: 1. dynamic AFS; 2. static LED dot matrix AFS; 3. digital micro-mirror (DMD) AFS.

Publication number is that the Chinese patent of CN102069749A discloses a kind of dynamically AFS, the program is the change being gathered surrounding environment by sensor group, then deflected in the horizontal and vertical directions by step motor control headlamp and realize adaptation function, but dynamically AFS is except traditional distance light, dipped beam, mainly realize bend and climb and fall light illumination mode, the light illumination mode that can realize is few, still needs to coordinate could realize adaptation function completely with other scheme.

Publication number is that the Chinese patent of CN103419709A discloses a kind of static LED dot matrix AFS, plurality of LEDs is lined up LED array by the program, different light illumination modes is realized by the luminous power controlling every LEDs on array, but because LED quantity is more, if a LEDs damages, so whole AFS all cisco unity malfunctions, and there is assembling adjustment difficulty and shortcoming not accurately controlled to light in the program.

Publication number is that the Chinese patent of CN102705767A discloses a kind of digital micro-mirror AFS, in this scenario, light is after rectangle light pipe all light, be irradiated to uniformly in digital micromirror elements, realize different light illumination modes by the upturned position (± 12 °) of micro mirror on control figure micro-mirror element and toggle frequency.But the program exists following defect: (1) dipped beam and distance light are all realized by digital micromirror elements, but dipped beam needs light beam wider and Illumination Distribution is relatively uniform, and distance light then needs light to concentrate, and range is farther.Such as, in the adaptive front lamp standard " UNIFORMPROVISIONSCONCERNINGTHEAPPROVALOFADAPTIVEFRONT-LI GHTINGSYSTEMS (AFS) FORMOTORVEHICLES (ECER123) " that Europe is promulgated, HV point brightness value when dipped beam is less than 0.7lux, and brightness value at least needs 38.4lux when distance light.So when the parameters of light source and lens is all constant, realize dipped beam only by micro mirror in digital micromirror elements and distance light can cause the defects such as light utilization efficiency is low, heat radiation difficulty is large, distance-light effect is all bad.(2) for dipped beam, at a high speed, town road and sleety weather light illumination mode all need to form the hot spot that has clear "cut-off"line on optical screen, and what in this scenario digital micromirror elements is formed is the rectangular light spot of 16:9 or 4:3, known by calculating, digital micromirror elements only have the micro mirror of 51.88% or 53.6% be in " ON " state (+12 °), there is the micro mirror of half to be nearly all in " OFF " state (-12 °), so not only increase the workload of digital micromirror elements chip but also waste a large amount of luminous energy.(3) rectangle light pipe optical length, all light effect are poor, can increase the volume of system, reduce the precision of control.

Therefore in adaptive front lamp technology, realize that light illumination mode is many and various mode effects is all good, control precisely, the efficiency of light energy utilization is high, heat radiation difficulty is little and equal short and all light effect is good optical plans of photosystem light path in the urgent need to a kind of.

Summary of the invention

In order to solve above-mentioned technical barrier, the invention provides a kind of adaptive front lamp method for designing based on fly's-eye lens.

Based on an adaptive front lamp method for designing for fly's-eye lens, comprise projection part and reflecting part, when bend and climb and fall, deflect certain angle with step motor control car light in horizontal and vertical direction; Projection part be used for realizing dipped beam, at a high speed, town road and sleety weather illumination functions; Reflecting part is used for realizing road function.

In projection part, adopt the collimate light that LED sends by paraboloid and collimation lens, light is irradiated in digital micromirror elements after double fly's-eye lens again.

Set up xyz coordinate system, z-axis is parallel to ground and points to automobile dead ahead, and x-axis is parallel to ground and vertical z-axis, and y-axis is perpendicular to ground; Select half angle of divergence to be the light source of LED light source two as projection part of θ, the reflecting surface of paraboloid meets: x ²+ z ²=2py (-2p≤x≤2p, $\frac{p+2{\mathrm{ptan}}^2\mathrm{\θ}-2p\tan \mathrm{\θ}\sqrt{1+{\tan }^2\mathrm{\θ}}}{2}\≤y\≤2p,$ z≤0)。

LED light source two be positioned at parabolic focus (0, 0), on, focal length is f ₁semicircle collimation lens be positioned at (0, 0), on, its optical axis overlaps with y-axis.

Often arrange fly's-eye lens all by M capable × N row lenslet unit forms, two planes of refraction of each lenslet unit are plane and radius of curvature is respectively the sphere of r, refractive index is n, and its focal length is f2=r/ (n-1), and the spacing of front-seat and rear row's lens equals f2; Often arrange the lenslet having three kinds of shapes in fly's-eye lens, the first row lens rectangular lens lower left are removed one trapezoidally to obtain, second row is rectangular lens lower left and upper right side are removed respectively one trapezoidally to obtain to the capable lens of M-1, and last column lens rectangular lens upper right side are removed one trapezoidally to obtain.

The length of each lenslet and shorter to be widely respectively with , and ratio is 16:4.5 or 4:1.5; The angle of lenslet medium dip part is 45 degree or 135 degree or 215 degree.

The ray-collecting reflected with the micro mirror that digital micromirror elements is in " OFF " state by a compound parabolic concentrator, curved light pipe and planoconvex spotlight two also projects the lower right of photometric screen.

The design's method beneficial effect is compared with prior art: the light illumination mode control precisely, realized is many and the effect of various light illumination mode is all good; Distance light and dipped beam are separately realized, reduces heat radiation difficulty; Utilize fly's-eye lens to be formed in digital micromirror elements evenly and there is the hot spot of "cut-off"line, saving luminous energy, improve the efficiency of light energy utilization; With double fly's-eye lens as equal photosystem, light path is short and all light effect is good.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of adaptive front lamp.

Fig. 2 is the schematic diagram of projection part.

Fig. 3 is the schematic diagram of three kinds of difformity lenslets in fly's-eye lens.

Fig. 4 is the schematic diagram of the fly eye lens array of 8 × 6.

Fig. 5 is the schematic diagram of double fly's-eye lens.

Fig. 6 is even in digital micromirror elements and has the hot spot figure of "cut-off"line.

Fig. 7 is the dipped beam light type figure that distance car light 25 meters photometric screen far away is formed.

1. projection parts in figure, 2. reflecting part, 3. free form surface, 4. reflective mirror, 5.LED light source one, 6. paraboloid, 7.LED light source two, 8. collimation lens, 9. front-seat fly's-eye lens, 10. after, arrange fly's-eye lens, 11. convergent lenses, 12. digital micromirror elements, 13. compound parabolic concentrators, 14. curved light pipes, 15 planoconvex spotlights one, 16. planoconvex spotlights two, 17 photometric screens, a lenslet in 18. fly's-eye lens the first rows, a lenslet of 19. fly's-eye lens mid portions, a lenslet in 20. fly's-eye lens last columns, the fly eye lens array of 21.8 × 6.

Detailed description of the invention

Specific embodiments is told about below in conjunction with accompanying drawing and example.

Fig. 1 is the schematic diagram of adaptive front lamp.Be made up of projection part and reflecting part, when bend and climb and fall, deflect certain angle with step motor control car light in horizontal and vertical direction; Projection part containing digital micro-mirror and fly's-eye lens, for realize dipped beam, at a high speed, town road and sleety weather illumination functions; LED light source and free-form surface reflector are contained in reflecting part, for realizing road function.In reflecting part, LED light source one is evenly distributed on cylindrical lamp socket, and there is a reflective mirror front end of cylindrical lamp socket, can by the light reflection without the direct outgoing of reflector on reflector.

Fig. 2 is the schematic diagram of projection part.In the reflector design of projection part, set up coordinate system, axle is parallel to ground and points to automobile dead ahead, axle is parallel to ground and vertical axle, axle is perpendicular to ground; Half angle of divergence is selected to be lED light source two as the light source of projection part, the curved surface of paraboloid meets: ( , , ), in order to save space, the inaccessiable part of parabola rear portion LED light line and parabola right half part being reduced and goes.LED light source two be positioned at its focal point (0, , 0) on, focal length is semicircle collimation lens be positioned at (0, , 0) on, its optical axis with axle overlaps, and is used for being transmitted into the beam collimation of reflector surface.

Collimated ray is irradiated in digital micromirror elements after double fly's-eye lens, digital micromirror elements forms one evenly and have the hot spot of "cut-off"line.Light is irradiated on the screen of 25 meters far away by the micro mirror being in " ON state " in digital micromirror elements; Be in " OFF " state micro mirror in digital micromirror elements and by light reflection on screen, the lower right of 25 meters of photometric screens far away after being collected with compound parabolic concentrator (CPC), curved light pipe and planoconvex spotlight two, can not be projected.This system realizes four kinds of light illumination modes, the ClassC(dipped beam respectively in adaptive front lamp standard " UNIFORMPROVISIONSCONCERNINGTHEAPPROVALOFADAPTIVEFRONT-LI GHTINGSYSTEMS (AFS) FORMOTORVEHICLES(ECER123) "), ClassV(town road), ClassE(at a high speed) and ClassW(sleety weather).

Adopt double fly's-eye lens, often arrange fly's-eye lens all by oK × row lenslet unit forms.Fig. 3 is the schematic diagram of three kinds of difformity lenslets in fly's-eye lens.The first row lenslet the cutting of rectangular lens lower left is gone one trapezoidally to obtain, as shown in Fig. 3 upper left corner (a).Second row to the capable lenslet of M-1 be by rectangular lens lower left and upper right side respectively cutting go one trapezoidally to obtain, as shown in Fig. 3 upper right corner (b).Last column lens the cutting of rectangular lens upper right side are gone one trapezoidally to obtain, as shown in Fig. 3 lower-left (c).The angle of lenslet medium dip part is 45 degree or 135 degree or 225 degree.

Fig. 4 is the schematic diagram of the fly eye lens array of 8 × 6.Two planes of refraction of each lenslet unit are plane and radius of curvature is respectively the sphere of r, and refractive index is n, and its focal length is , the spacing of front-seat and rear row's lens ; The length of each lenslet and shorter to be widely respectively with , and in order to mate with digital micromirror elements, lenslet length and shorter wide ratio get 4:1.5.Although in the present embodiment, the length-width ratio of lenslet is 4:1.5, and the length-width ratio of lenslet is got 16:4.5 and is also fine.

Fig. 5 is the schematic diagram of double fly's-eye lens, light is irradiated on double fly's-eye lens through reflector is parallel after collimation lens, light source is divided into many small light sources by front-seat fly's-eye lens, rear row's fly's-eye lens is again by these small light source imagings, after convergent lens, the picture of small light source is superimposed upon in digital micromirror elements.

Fig. 6 be in digital micromirror elements evenly and there is the hot spot figure of "cut-off"line, evenly and have "cut-off"line, dead line first level in left side tilts 45 degree, right side dead line level to the hot spot in digital micromirror elements again.

Fig. 7 is the dipped beam light type figure that car light is formed on the photometric screen of 25 meters far away, in the drawings, dipped beam light type has "cut-off"line and each particular point (as B50L, 75R etc.) and special area (as Ith district, IIIth district etc.) clearly all to meet adaptive front lamp standard " UNIFORMPROVISIONSCONCERNINGTHEAPPROVALOFADAPTIVEFRONT-LI GHTINGSYSTEMS (AFS) FORMOTORVEHICLES(ECER123) ".For at a high speed, town road and sleety weather illumination functions, can be realized equally by the upturned position (± 12 °) of micro mirror on control figure micro-mirror element and toggle frequency.

Above-described embodiment is illustrative principle of the present invention and effect only; and the embodiment of part, for the person of ordinary skill of the art, without departing from the concept of the premise of the invention; can also make some distortion and improvement, these all belong to protection scope of the present invention.

Claims (1)

1. the adaptive front lamp method for designing based on fly's-eye lens, comprise projection part and reflecting part, when bend and climb and fall, deflect certain angle with step motor control car light in horizontal and vertical direction, it is characterized in that: projection part be used for realizing dipped beam, at a high speed, town road and sleety weather illumination functions; Reflecting part is used for realizing road function;

In projection part, adopt the collimate light that LED sends by paraboloid and collimation lens; Light is irradiated in digital micromirror elements again after double fly's-eye lens;

Set up xyz coordinate system, z-axis is parallel to ground and points to automobile dead ahead, and x-axis is parallel to ground and vertical z-axis, and y-axis is perpendicular to ground; Select half angle of divergence to be the light source of LED light source two as projection part of θ, the reflecting surface of paraboloid meets: $x^2+z^2=2py(-2p\≤x\≤2p,\frac{p+2{\mathrm{ptan}}^2\mathrm{\θ}-2ptan\mathrm{\θ}\sqrt{1+{\tan }^2\mathrm{\θ}}}{2}\≤y\≤2p,$ $z\≤0);$

LED light source two is positioned at parabolic focus on, focal length is f ₁semicircle collimation lens be positioned at on, its optical axis overlaps with y-axis;

Often arrange fly's-eye lens all by M capable × N row lenslet unit forms, two planes of refraction of each lenslet unit are plane and radius of curvature is respectively the sphere of r, refractive index is n, and its focal length is f2=r/ (n-1), and the spacing of front-seat and rear row's lens equals f2; Often arrange the lenslet having three kinds of shapes in fly's-eye lens, the first row lens rectangular lens lower left are removed one trapezoidally to obtain, second row is rectangular lens lower left and upper right side are removed respectively one trapezoidally to obtain to the capable lens of M-1, and last column lens rectangular lens upper right side are removed one trapezoidally to obtain;

The length of each lenslet and shorter to be widely respectively with and ratio is 16:4.5 or 4:1.5; The angle of lenslet medium dip part is 45 degree or 135 degree or 215 degree;

The ray-collecting reflected with the micro mirror that digital micromirror elements is in " OFF " state by a compound parabolic concentrator, curved light pipe and planoconvex spotlight two also projects the lower right of photometric screen.